Materials Literature
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The form birefringence of subwavelength period gratings can be applied to realize phase-retardation elements. Previous researchers used high-frequency surface relief structures or sinusoidal gratings formed in photoresist to fabricate phase-retardation elements. We present the performance of a volume holographic quart…
Nomenclatural notes are provided for 13 species of Marsdenia R.Br. including a number of taxa formerly included in Gymnema R.Br., Bidaria (Endl.) Decne. and Jasminanthes Blume. New names provided in Marsdenia are M. jasminoides P.I.Forst. (Jasminanthes suaveolens Blume), M. ridleyi P.I.Forst. (Stephanotis parviflora R…
The patented Carver-Greenfield (C-G) Process®, a combination of dehydration and solvent extraction treatment technologies, has a wide range of uses in separating hydrocarbon solvent-soluble hazardous organic contaminants (indigenous oil) from sludges, soils, and industrial wastes. As a result of this treatment, the pr…
The problem of the formation and accumulation of the tritiated heavy and light water wastes produced under operation of the various nuclear facilities is considered. It is shown that the tritium contaminated wastes may have a wide spectrum of isotope concentrations of H:D:T and correlation one with other. Reprocessing…
The mechanisms and products of the reactions which occur during the sintering of SiC with Al2O3 as a sintering aid were analysed. The effects of two sintering atmospheres, namely pressurised CO and Ar gases, on the reaction thermodynamics and reaction products were investigated. Thermodynamically predicted reaction pr…
The nitridation of Zr2Fe has been investigated with respect to its performance as a getter for detritiation of N2 gas streams. At temperatures of 150–550°C, Zr2Fe reacts with N2 at rates dx/dt(in Zr2FeNx) which follow the Arrhenius equation with activation energy Q = 35 kJ/mole. A maximum nitrogen concentration of x =…
The reaction of aqueous solutions of potassium tetracyanozincate, zinc chloride, and pyridine yields crystals of [Zn(py) 2 ][Zn(CN) 4 ], The crystals are orthorhombic, space group Cccm, a = 926.7(4), b = 1340.8(4), c = 1343.3(4) pm. The structure is polymeric and consists of alternate arrays of tetrahedrally and octah…
Other| October 01, 1995 Plumboferrite: New mineralogical data and atomic arrangement Dan Holtstam; Dan Holtstam Uppsala University, Institute of Earth Sciences, Uppsala, Sweden Search for other works by this author on: GSW Google Scholar Rolf Norrestam; Rolf Norrestam Search for other works by this author on: GSW Goog…
Abstract Measurements of electrical conductivity, thermoelectric power, and crystallographic structure of tungsten trioxide are presented. It is found that the predominant charge carriers are electrons related to nonstoichiometry in the oxygen sublattice (WO 3− y ). At y = 0.1 the investigated material undergoes a sem…
The chemical surface modification of poly(tetrafluoroethylene) (PTFE) film was carried out in hydrazine gas photolyzed with ArF excimer laser irradiation. Hydrophilic surface appeared on PTFE film after the laser treatment. The surface was analyzed with a measurement of water contact angle, X-ray photoelectron spectro…
The effective tritium recovery system should be designed to recover tritium from DT reactor blanket sweep gas in a form easy to transfer to the main fuel cycle. The cryosorption method using a porous adsorbent at the temperature of liquid nitrogen is one of the candidate processes for extracting tritium from hydrogen-…
The opening roller system for fiber separation in an open end spinning process is known to cause considerable fiber breakage. We have investigated fiber breakage at different opening roller speeds and the relationship between breakage and the properties of friction spun yams made from cotton, polyester, viscose, and a…
The room-temperature single-crystal X-ray structure refinement of Nb 2 Zr X-2 O 2x+1 , x = 12, as an incommensurate compositely modulated structure is reported. It consists of two component substructures, referred to as the metal substructure (M), a M = 5.108 (1), b M =4.997(1), c M =5.278(1)A, and the oxygen substruc…
Production scale separation of tritium from other hydrogen isotopes at the Savannah River Site (SRS) in Aiken, SC, USA, has been accomplished by several methods. These methods include thermal diffusion (1957–1986), fractional absorption (1964–1968), and cryogenic distillation (1967–present). Most recently, the Thermal…
The full scale experimental assembly for study of the hydrogen isotope separation by cryogenic distillation is described. The cryogenic column has the diameter up to 300 mm, height of 5,5 m and place in the vacuum jacket diameter of 1200 mm and height of 6,5 m. There is a possibility to change the mass exchange sectio…
The results of experimental studies and thermodynamic calculations of melting diagrams of the 3-d transition metal-carbon systems are discussed in this paper. The authors present their theoretical and experimental results which complement the earlier available data. The Fe-Ni-C, Fe-Co-C, and Mn-Ni-C systems are shown…
Abstract The thermal conductivity and thermal expansivity of a thermotropic liquid crystalline copolyesteramide with draw ratio λ from 1.3 to 15 have been measured parallel and perpendicular to the draw direction from 120 to 430 K. The sharp rise in the axial thermal conductivity K par; and the drastic drop in the axi…
The kinetics of the sorption of molecular hydrogen by ZrCo and Zi0.8Ti0.3Mn1.9 was investigated as function of temperature at several constant pressures of hydrogen. A comparison between the isothermal hydrogen sorption rates by ZrCo, Zr0.8Ti0.3Mn1.9 and LaNi4.7A10.3 is given and reaction mechanisms are discussed. Fro…
The dynamics of the phase of the molecular tilt in the helical ferroelectric liquid crystalline Sm-${\mathit{C}}^{\mathrm{*}}$ phase is studied within the Landau model. We show that a static electric field applied parallel to smectic layers induces a gap in the excitation spectrum of the phase of the tilt at the edge…
Differential anomalous x-ray scattering measurements were made on a well-annealed and a photodarkened amorphous ${\mathrm{As}}_{2}$${\mathrm{S}}_{3}$ film of 4 \ensuremath{\mu}m in thickness as well as on a well-annealed 30 \ensuremath{\mu}m sample, all of which were supported on Si (100) wafers. The thicker sample wa…